﻿// --------------------------------------------------------------------------------------------------------------------
// <copyright file="TagListToStringConverter.cs" company="Concept Architecture">
//   (c) 2010 Muhammad Umer Farooq
// </copyright>
// <summary>
//   Defines the  type.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace Hisaab.Windows.Client.Converters
{
    using System;
    using System.Collections.Generic;
    using System.Globalization;
    using System.Text;
    using System.Windows.Data;
    using Model;

    /// <summary>
    /// Defines the <seealso cref="TagListToStringConverter"/> type.
    /// </summary>
    [ValueConversion(typeof(IEnumerable<Tag>), typeof(string))]
    public class TagListToStringConverter : IValueConverter
    {
        /// <summary>
        /// Gets or sets a value indicating whether to append with comma.
        /// </summary>
        /// <value>
        ///   <c>true</c> if [append with comma]; otherwise, <c>false</c>.
        /// </value>
        public bool AppendWithComma { get; set; }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is IEnumerable<Tag>)
            {
                var builder = new StringBuilder();
                foreach (var tag in value as IEnumerable<Tag>)
                {
                    if (AppendWithComma)
                    {
                        builder.AppendFormat("{0}, ", tag.Name);
                    }
                    else
                    {
                        builder.AppendLine(tag.Name);
                    }
                }

                return AppendWithComma ? builder.ToString().Trim().Trim(new[] { ',' }) : builder.ToString();
            }

            return string.Empty;
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value that is produced by the binding target.</param><param name="targetType">The type to convert to.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}